Vaĭsbord, È. M. Über die Existenz einer periodischen Lösung bei nichtlinearen Gleichungen dritter und vierter Ordnung. (Russian) Zbl 0117.05801 Nauchn. Dokl. Vyssh. Shkoly, Fiz.-Mat. Nauki 1959, No. 3, 10-13 (1960). MSC: 34C25 PDFBibTeX XMLCite \textit{È. M. Vaĭsbord}, Nauchn. Dokl. Vyssh. Shkoly, Fiz.-Mat. Nauki 1959, No. 3, 10--13 (1960; Zbl 0117.05801)
Blinchevskiĭ, V. S. Existence of a periodic solution for an autonomous system of \(n\) differential equations. (Existenz einer periodischen Lösung bei einem autonomen System von \(n\) Differentialgleichungen.) (Russian) Zbl 0112.06101 Mat. Sb., N. Ser. 50(92), No. 1, 117-126 (1960). Reviewer: Miloš Ráb (Brno) MSC: 34C25 PDFBibTeX XMLCite \textit{V. S. Blinchevskiĭ}, Mat. Sb., Nov. Ser. 50(92), 117--126 (1960; Zbl 0112.06101) Full Text: EuDML MNR
Blair, K. W.; Loud, W. S. Periodic solutions of \(x'' + cx' + g(x) = Ef(t)\) under variation of certain parameters. (English) Zbl 0101.06904 J. Soc. Ind. Appl. Math. 8, 74-101 (1960). Reviewer: J. M. Skowroński MSC: 34C25 PDFBibTeX XMLCite \textit{K. W. Blair} and \textit{W. S. Loud}, J. Soc. Ind. Appl. Math. 8, 74--101 (1960; Zbl 0101.06904) Full Text: DOI
Shimanov, S. N. On the theory of oscillations of quasi-linear systems with constant lags. (English. Russian original) Zbl 0101.06901 Autom. Remote Control 21, 490-492 (1960); translation from Avtom. Telemekh. 21, 706-709 (1960). Reviewer: O. Vejvoda MSC: 34K14 PDFBibTeX XMLCite \textit{S. N. Shimanov}, Autom. Remote Control 21, 490--492 (1960; Zbl 0101.06901); translation from Avtom. Telemekh. 21, 706--709 (1960)
Èl’sgol’ts, L. È. Certain properties of periodic solutions of linear and quasilinear differential equations with retarded arguments. (Gewisse Eigenschaften der periodischen Lösungen linearer und quasilinearer Differentialgleichungen mit retardierten Argumenten.) (Russian) Zbl 0090.29801 Vestn. Mosk. Univ., Ser. Mat. Mekh. Astron. Fiz. Khim. 14, No. 5, 229-234 (1960). Reviewer: Aristide Halanay (Bucureşti) MSC: 34K13 PDFBibTeX XMLCite \textit{L. È. Èl'sgol'ts}, Vestn. Mosk. Univ., Ser. Mat. Mekh. Astron. Fiz. Khim. 14, No. 5, 229--234 (1960; Zbl 0090.29801)